Author Topic: Question about Vacuum Assisted Braking options.  (Read 1474 times)

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ianacole

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Question about Vacuum Assisted Braking options.
« on: June 21, 2006, 12:46:55 AM »
I have experienced situations when switching from gas to brake rapidly the motor has not had time to create enough vacuum to assist in braking.  As such, I am looking at bypassing the manifold vacuum using an electric vacuum pump, this one:

 ELECTRIC VACUUM PUMP KIT

So, my question is this.  As I read it, the kit will keep between 18 and 22" of vacuum.  Can someone tell me what this would translate on the output to boost?  Would it be enough to provide SOME boost assist at low RPM until the turbo spools (my turbo hits at about 3200 RPM - KO3S, then I spike to about 24psi)?  Would it be beneficial to route/tap the output side of the pump into the manifold?  Any idea if this would put out enough boost to be able to "fill up" the intake system?

I guess what I'm wondering about is the STI no lag systems that I've heard about, but have seen no true write up of it.

Thanks!
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gragravar

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Re: Question about Vacuum Assisted Braking options.
« Reply #1 on: June 21, 2006, 12:57:08 AM »
to convert inches Hg to PSI, multiply by 0.4912

18 x 0.4912 = 8.8416 PSI

might be a start for you but seems a little low.
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Re: Question about Vacuum Assisted Braking options.
« Reply #1 on: June 21, 2006, 12:57:08 AM »

ianacole

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Re: Question about Vacuum Assisted Braking options.
« Reply #2 on: June 21, 2006, 01:04:39 AM »
Thanks for that Andrew.  I'll have to pay attention this weekend and see what kind of boost I'm putting out at about 22~2500 RPM.  If I had an alternate input of boost, say at the intercooler, would it augment the turbo, or be a detriment?
"The corruption of man is followed by corruption of language." -Emerson

Think you're fast? http://www.rmsolo.org

For the road racer in all of us: http://www.nasarockymountain.com